Terahertz emission from low-temperature grown gallium arsenide photoconductive antenna: A comparative analysis using Drude-Lorentz, Equivalent Circuit Models, and Finite Element Analysis

Abstract

In this work, the terahertz emission from low-temperature-grown GaAs photoconductive antennas was simulated via Drude-Lorentz Model, Equivalent Circuit Model (ECM), and Finite Element Analysis (FEA) and were compared to experimental data. Results show that the THz peak amplitude calculated via FEA closely matches (~1.04x) the experimental THz peak amplitude. The THz peak amplitudes calculated from the Drude-Lorentz and ECM are ~3.01x higher and ~ 4.05x lower as compared to the experimental result, respectively. Furthermore, from the emission spectra, the calculated bandwidth from FEA is ~1 THz bandwidth which closely matches the experimental result of ~2 THz. Meanwhile, the calculated bandwidth for both Drude Lorentz and ECM models is ~5 THz.